21222022 has 16 divisors (see below), whose sum is σ = 32555952. Its totient is φ = 10372320.

The previous prime is 21222013. The next prime is 21222023. The reversal of 21222022 is 22022212.

It is a junction number, because it is equal to n+sod(n) for n = 21221993 and 21222011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23593 + ... + 24475.

It is an arithmetic number, because the mean of its divisors is an integer number (2034747).

Almost surely, 2^21222022 is an apocalyptic number.

21222022 is a deficient number, since it is larger than the sum of its proper divisors (11333930).

21222022 is a wasteful number, since it uses less digits than its factorization.

21222022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 21222022 is about 4606.7365889532. The cubic root of 21222022 is about 276.8612997958.

Adding to 21222022 its reverse (22022212), we get a palindrome (43244234).

It can be divided in two parts, 212 and 22022, that multiplied together give a palindrome (4668664).

The spelling of 21222022 in words is "twenty-one million, two hundred twenty-two thousand, twenty-two".